Sr Mechanical Cx Engineer, Data Center Engineering

Sr Mechanical Cx Engineer, Data Center Engineering

Do you want to help build some of the largest and most consequential enterprise and customer technology systems in the world? Join Apple’s Information Systems and Technology (IS&T) organization. IS&T is the engine behind everything Apple does for customers and for the people who build for them. It’s Apple’s central nervous system. Supporting 2.5 billion active Apple devices, processing billions of secure transactions, and keeping the technology that defines modern life running flawlessly, IS&T makes the impossible feel effortless.

Do you love building solutions to handle global complexity and immense scale? Imagine what you could do here.

Infrastructure Services is part of IS&T and the foundation of Apple's global network operations - managing data center equipment and systems to deliver compute, storage, and networking services for teams across Apple, including its internal developer community. From individual facilities to a worldwide network, Infrastructure Services ensures the technology underneath everything works without question.

The Data Center Commissioning team is looking for a Senior Technical Mechanical Engineer with depth in mechanical cooling systems, hydronics, airflow dynamics, fire protection systems, and mechanical building automation. The successful candidate will serve as the primary mechanical technical authority across the full commissioning lifecycle (Levels 1-5) supporting all new Apple data centers, enterprise compute expansions, and specialized critical spaces/labs.

In this role, you will govern the end-to-end commissioning lifecycle by managing third-party Commissioning Agents (CxA) rather than executing tests directly. With a strong emphasis on technical oversight, script validation, and cross-functional leadership, you will direct all project phases, including design commissionability reviews, Factory Acceptance Testing (FAT), Pre-Functional Testing (PFT), Functional Performance Testing (FPT), and Integrated Systems Testing (IST).

• Serve as the primary mechanical commissioning senior engineer across all new Apple data centers and critical infrastructure, governing the complete Level 1 through Level 5 commissioning lifecycle.
• Develop, author, and standardize global mechanical commissioning playbooks, test scripts, functional performance procedures, and Integrated Systems Testing (IST) execution plans.
• Evaluate, onboard, manage, and audit third-party Commissioning Agents (CxA), mechanical contractors, and Test and Balance (TAB) firms during onsite testing and verification.
• Perform technical commissionability reviews on Basis of Design (BOD), MEP drawing packages, P&IDs, and sequences of operations (SOO) to guarantee testability and operational resilience.
• Oversee and validate Factory Acceptance Testing (FAT) for major mechanical equipment, including chillers, cooling towers, custom AHUs, CRAH/CRAC units, and hydronic pump skids.
• Lead the technical validation of advanced high-density liquid cooling topologies, including direct-to-chip loops, hydronic distribution, secondary fluid quality, and CDU performance.
• Oversee the commissioning of critical fire protection and life safety systems, while managing strict adherence to Methods of Procedure (MOPs) and mechanical Lockout/Tagout (LOTO) safety protocols.
• Drive mechanical root cause analysis during live load testing, partnering with Controls and Electrical engineers to validate cross-domain interlocks, emergency power-off (EPO), and complex failover schemes.
• Guide the operational turnover process by ensuring accurate baseline trending, comprehensive O&M documentation, warranty readiness, and hands-on facility training.

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